Controller for a heating system



FIG. 1 is a perspective view of a controller for a heating system showing our new design;

FIG. 2 is front elevational view showing the design for the controller for the heating system of FIG. 1;

FIG. 3 is a rear elevational view showing the design for the controller for the heating system of FIG. 1;

FIG. 4 is a left side elevational view showing the design for the controller for the heating system of FIG. 1;

FIG. 5 is a right side elevational view showing the design for the controller for the heating system of FIG. 1;

FIG. 6 is a top elevational view showing the design for the controller for the heating system of FIG. 1; and,

FIG. 7 is a bottom elevational view showing the design for the controller for the heating system of FIG. 1.

The broken lines shown in the drawings illustrate portions of the controller for a heating system that form no part of the claimed design. 

CLAIM The ornamental design for a controller for a heating system, as shown and described. 